Sauce for the Gander by Jayne Davis

A duel. An ultimatum. An arranged marriage. England, 1777 Will, Viscount Wingrave, whiles away his time gambling and bedding married women, thwarted in his wish to serve his country by his controlling father. News that his errant son has fought a duel with a jealous husband is the last straw for the Earl of Marstone. He decrees that Will must marry. The earl’s eye lights upon Connie Charters, whose position as unpaid housekeeper for a poor but socially ambitious father hides her true intelligence. Connie wants a husband who will love and respect her, not a womaniser and a gambler. When her conniving father forces the match, she has no choice but to agree. Will and Connie meet for the first time at the altar. As they settle into their new home on the wild coast of Devonshire, the young couple find they have more in common than they thought. But there are dangerous secrets that threaten both them and the nation. Can Will and Connie overcome the dark forces that conspire against them and find happiness together? Sauce for the Gander is Book 1 in the Marstone series, but can also be read as a standalone novel with no cliffhangers.